Voprf update (#255)

* Update to latest voprf

* Upgrade to Rust edition 2021

* Fix Clippy

* Remove all allocations

* Remove unnecessary `allow(type_alias_bounds)`

* Make all serialization infallible

* Remove self-dependency

* Update rustyline

.github/workflows/main.yml

@@ -19,10 +19,7 @@ jobs:
           - x25519_u64,ristretto255_u64
         toolchain:
           - stable
-          - 1.51.0
-        exclude:
-          - backend_feature: p256
-            toolchain: 1.51.0
+          - 1.56.1
     name: test
     steps:
       - name: Checkout sources
@@ -102,7 +99,7 @@ jobs:
       matrix:
         toolchain:
           - stable
-          - 1.51.0
+          - 1.56.1
     name: test simple_login command-line example
     steps:
       - name: install expect
@@ -125,7 +122,7 @@ jobs:
       matrix:
         toolchain:
           - stable
-          - 1.51.0
+          - 1.56.1
     name: test digital_locker command-line example
     steps:
       - name: install expect